package com.share.interceptor;

import org.apache.commons.lang3.RandomStringUtils;
import org.slf4j.MDC;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * author:caifan
 * date:2019/4/6
 */
public class LogInterceptor extends HandlerInterceptorAdapter {
    private static String MDC_REQ_ID = "reqId";

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        MDC.put(MDC_REQ_ID, RandomStringUtils.randomAlphabetic(10));
        return super.preHandle(request, response, handler);
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        MDC.remove(MDC_REQ_ID);
        super.afterCompletion(request, response, handler, ex);
    }
}
